Chlorides, Oxochlorides, and Oxoacids of 1,8-Diphosphanaphthalene: A System with Imposed Close P···P Interaction

Several new 1,8-diphosphanaphthalene oxochloro compounds and oxoacids were prepared and fully characterized.
The new compounds are discussed in the broader context with other known congeners to demonstrate the variability
of the diphosphanaphthalene scaffolding's bonding patterns. Three principal modes of interaction of the phosphorus
moieties were observed in the series:  bonding, bridging, and repulsive, resulting respectively in none, moderate,
and substantial crowding and distortions. The unexpected dimeric diphosphaacenaphthene anion has been obtained
from disproportionative hydrolysis of Nap(PCl2)2 (Nap = naphthalene-1,8-diyl).